Display panel and display apparatus

ABSTRACT

The present application discloses a display panel and a display apparatus. The display panel includes a substrate, an electrostatic discharge circuit disposed on the substrate and including a voltage gate high terminal (VGH terminal), a voltage gate low terminal (VGL terminal), an electrostatic input end and a common voltage terminal (VCOM terminal) coupled to components of the display panel, a first discharge unit and a second discharge unit, where the first discharge unit includes a first P-type thin film transistor and a second P-type thin film transistor, a gate of the first P-type thin film transistor is connected to a drain of the first P-type thin film transistor, and a gate and a drain of the first P-type thin film transistor are also connected to the VGH terminal, a source of the first P-type thin film transistor is connected to the electrostatic input end, a gate of the second P-type thin film transistor is connected to a drain of the second P-type thin film transistor, and a gate and a drain of the second P-type thin film transistor are also connected to the source of the first P-type thin film transistor, a source of the second P-type thin film transistor is connected to the VGL terminal, an input end of the second discharge unit is connected to the electrostatic input end, and an output end of the second discharge unit is connected to the VCOM terminal.

TECHNICAL FIELD

The present application relates to the technical field of displays, andparticularly relates to a display panel and a display apparatus.

BACKGROUND

Liquid crystal display apparatuses have numerous advantages, such as athin body, power saving, no radiation, etc., and are widely used. Mostliquid crystal display apparatuses in a current market are backlitliquid crystal display apparatuses, each including a liquid crystalpanel and a backlight module. Working principle of the liquid crystalpanel is that liquid crystals are put in two parallel glass substrates,and a driving voltage is applied to the two glass substrates to controlrotational direction of the liquid crystals, to refract light rays ofthe backlight module to generate a picture.

Thin film transistor liquid crystal display apparatuses (TFT-LCDapparatuses) currently maintain a leading status in the display fieldbecause of low power consumption, excellent picture quality, highproduction yield, and other properties. Similarly, the TFT-LCD apparatuscomprises a liquid crystal panel and a backlight module. The displaypanel comprises a color filter substrate (CF substrate), a thin filmtransistor substrate (TFT substrate), a mask and transparent electrodeson relative inner sides of the above substrates. A layer of liquidcrystals (LC) is positioned between two substrates.

However, in a circuit of the display panel, components in the circuitare easy to be damaged by electrostatic discharge (ESD). Particularlywhen an ESD voltage appears on a picture element array, in an ESDprotection circuit manufactured beside the picture element array,elements used in the circuit do not have low breakdown voltage or highconduction speed, and often cannot be conducted in time to discharge ESDcurrent.

SUMMARY

A technical problem to be solved by the present application is toprovide a display panel having a protection circuit for increasingelectrostatic discharge (ESD) current.

In addition, the present application further provides a displayapparatus.

A purpose of the present application is realized through a technicalsolution as follows.

A display panel comprises:

a substrate including a plurality of pixel regions, and

an electrostatic discharge circuit disposed on the substrate,

where the electrostatic discharge circuit comprises a voltage gate highterminal (VGH terminal) a voltage gate low terminal (VGL terminal), anelectrostatic input end and a common voltage terminal (VCOM terminal)coupled to components of the display panel, and

first discharge unit comprising a first P-type thin film transistor anda second P-type thin film transistor, where a gate of the first P-typethin film transistor is connected to a drain of the first P-type thinfilm transistor, and a gate and a drain of the first P-type thin filmtransistor are also connected with the VGH terminal, a source of thefirst P-type thin film transistor is connected to the electrostaticinput end, a gate of the second P-type thin film transistor is connectedto a drain of the second P-type thin film transistor, and a gate and adrain of the second P-type thin film transistor are also connected tothe source of the first P-type thin film transistor, and a source of thesecond P-type thin film transistor is connected to the VGL terminal, and

a second discharge unit, where an input end of the second discharge unitis connected to the electrostatic input end, and an output end of thesecond discharge unit is connected to the VCOM terminal.

The second discharge unit comprises a first conducting line with one endconnected to the VCOM terminal. The VCOM terminal is connected to GND. Aline thickness required for a conducting line used between the VGHterminal and the VGL terminal is small, which is equivalent to a largeresistor station. A relative leakage current is also small. A capabilityof the first discharge unit alone to perform current leakage isinsufficient. However, the second conducting line is used for connectingto GND. A line width of the second conducting line is greatly largerthan line widths of VGH terminal and VGL terminal. Therefore,dischargeable current is greater than original current, to achieve abetter protection.

The second discharge unit comprises a first conducting line with one endconnected to the VCOM terminal. The VCOM terminal is connected to a VCOMterminal of the display panel. A line thickness required for aconducting line used between the VGH terminal and the VGL terminal) issmall, which is equivalent to a large resistor station. A relativeleakage current is also small. A capability of the first discharge unitalone to perform current leakage is insufficient. However, the secondconducting line is used for connecting to a VCOM terminal. A line widthof the second conducting line is greatly larger than line widths of VGHterminal and VGL terminal. Therefore, dischargeable current is greaterthan original current, achieving a better protection.

The second discharge circuit comprises a third thin film transistor. Aninput end and a control end of the third thin film transistor areconnected to the electrostatic input end. An output end of the thirdthin film transistor is connected to the VCOM terminal. The seconddischarge unit leaks current through the third thin film transistor,which is simple, effective and reliable in arrangement.

The second discharge circuit comprises a capacitor. A first end of thecapacitor is connected to the electrostatic input end. A second end ofthe capacitor is connected to the control end of the third thin filmtransistor. Through characteristics of direct current blocking,alternating current conducting, high frequency conducting and lowfrequency blocking of the capacitor, when a voltage range is withinvoltage gate low (VGL) to voltage gate high (VGH), the second dischargeunit does not participate in the effect. Meanwhile, when the voltagerange is not within VGL to VGH, for example, when a positive largevoltage appears instantaneously, the second discharge unit can beproperly operated without producing VGL current reserved by the secondthin film transistor.

The second discharge circuit comprises a fourth thin film transistor. Acontrol end of the fourth thin film transistor is connected to the VGLterminal. An output end of the fourth thin film transistor is connectedto the VGH terminal. Conduction of the fourth thin film transistorfurther completes a discharge function of the second discharge unit.Meanwhile, a potential of the second end of the capacitor is pulled tobe consistent with the VCOM terminal. Because of this, when the voltagerange is within VGL to VGH, the third thin film transistor is notconducted to discharge to influence proper operation of the protectioncircuit.

The second discharge circuit comprises a third thin film transistor, acapacitor and a fourth thin film transistor. An input end and a controlend of the third thin film transistor are connected to the electrostaticinput end. An output end of the third thin film transistor is connectedto the VCOM terminal. The VCOM terminal is connected to GND. A first endof the capacitor is connected to the electrostatic input end. A secondend of the capacitor is connected to the control end of the third thinfilm transistor. An input end of a fourth thin film transistor isconnected to the second end of the capacitor. A control end of thefourth thin film transistor is connected to the VGL terminal. An outputend of the fourth thin film transistor is connected to the VGH terminal.

The third thin film transistor and the fourth thin film transistor areP-type thin film transistors: a third P-type thin film transistor and afourth P-type thin film transistor. A source of the third P-type thinfilm transistor is connected to a gate of the second P-type thin filmtransistor. A drain of the third P-type thin film transistor isconnected to the VCOM terminal. The VCOM terminal is connected to GND. Afirst end of the capacitor is connected to the electrostatic input end.A second end of the capacitor is connected to a gate of the third P-typethin film transistor. A source of the fourth P-type thin film transistoris connected to the second end of the capacitor. A gate of the fourthP-type thin film transistor is connected to the VGL terminal. A drain ofthe fourth P-type thin film transistor is connected to the VGH terminal.This is an embodiment of the protection circuit and defines specificallyused electrical elements and connection relationships.

The display panel comprises a gate integrated circuit. The VGH terminaland the VGL terminal are respectively connected at a TFT voltage turn-onend and a TFT voltage turn-off end of the gate integrated circuit. Thisis specific connection of VGH terminal and VGL terminal.

According to another aspect of the present application, the presentapplication further discloses a display apparatus. The display apparatuscomprises a backlight module and the above display panel.

In the present application, since the connected first discharge unit andsecond discharge unit act jointly and the other end of the seconddischarge unit is connected to the VCOM terminal, an ESD current path isincreased, and speed and number of leakage current are increased,thereby realizing a better protection for the display panel andprolonging service life.

BRIEF DESCRIPTION OF DRAWINGS

The drawings included are used for providing further understanding ofembodiments of the present application, constitute portion of thedescription, and are used to illustrate implementation manners of thepresent application, and interpret principles of the present applicationtogether with text description. Apparently, the drawings in thefollowing description are merely some embodiments of the presentapplication, and for those of ordinary skill in the art, other drawingscan also be obtained according to the drawings without contributingcreative labor. In the drawings:

FIG. 1 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 2 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 3 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 4 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 5 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 6 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 7 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 8 is a schematic diagram of a protection circuit of a display panelin an embodiment of the present application.

FIG. 9 is a structural schematic diagram of a display panel in anembodiment of the present application.

DETAILED DESCRIPTION

Specific structure and function details disclosed herein are onlyrepresentative and are used for the purpose of describing exemplaryembodiments of the present application. However, the present applicationmay be specifically achieved in many alternative forms and shall not beinterpreted to be only limited to the embodiments described herein.

It should be understood in the description of the present applicationthat terms such as “central”, “horizontal”, “upper”, “lower”, “left”,“right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”,etc. indicate direction or position relationships shown based on thedrawings, and are only intended to facilitate the description of thepresent application and the simplification of the description ratherthan to indicate or imply that the indicated apparatus or element musthave a specific direction or constructed and operated in a specificdirection, and therefore, shall not be understood as a limitation to thepresent application. In addition, the terms such as “first” and “second”are only used for the purpose of description, rather than beingunderstood to indicate or imply relative importance or hint the numberof indicated technical features. Thus, the feature limited by “first”and “second” can explicitly or impliedly include one or more features.In the description of the present application, the meaning of “aplurality of” is two or more unless otherwise specified. In addition,the term “comprise” and any variant are intended to cover non-exclusiveinclusion.

It should be noted in the description of the present application that,unless otherwise specifically regulated and defined, terms such as“installation,” “connected,” and “connection” shall be understood inbroad sense, and for example, may refer to fixed connection ordetachable connection or integral connection, may refer to mechanicalconnection or electrical connection, and may refer to direct connectionor indirect connection through an intermediate medium or innercommunication of two elements. For those of ordinary skill in the art,the meanings of the above terms in the present application may beunderstood according to concrete conditions.

The terms used herein are intended to merely describe specificembodiments, not to limit the exemplary embodiments. Unless otherwisenoted clearly in the context, singular forms “one” and “single” usedherein are also intended to comprise plurals. It should also beunderstood that the terms “comprise” and/or “include” used hereinspecify the existence of stated features, integers, steps, operation,units and/or assemblies, not excluding the existence or addition of oneor more other features, integers, steps, operation, units, assembliesand/or combinations of these.

The present application will be further described in detail below incombination with the drawings and preferred embodiments.

In an embodiment of the present application, as shown in FIGS. 1-2, thedisplay panel comprises a substrate including a plurality of pixelregions, and an electrostatic discharge circuit disposed on thesubstrate and including a voltage gate high terminal (VGH terminal), avoltage gate low (VGL terminal), an electrostatic input end and a commonvoltage terminal (VCOM terminal) coupled to components of the displaypanel; and a first discharge unit, where an output end of the firstdischarge unit is respectively connected to the VGH terminal and the VGLterminal, and a control end and an input end of the first discharge unitare connected to the electrostatic input end; and a second dischargeunit, where an input end of the second discharge unit is connected tothe electrostatic input end, and an output end of the second dischargeunit is connected to the VCOM terminal. The first discharge circuitcomprises a first thin film transistor and a second thin filmtransistor. An output end of the first thin film transistor is connectedto the VGH terminal. An input end of the first thin film transistor andan output end of the second thin film transistor are connected to theelectrostatic input end. An input end of the second thin film transistoris connected to the VGL terminal. In the present application, since theconnected first discharge unit and second discharge unit act jointly andthe other end of the second discharge unit is connected to the VCOMterminal, an ESD current path is increased, and speed and number ofleakage current are increased, thereby realizing a better protection forthe display panel and prolonging service life. As shown in FIG. 9, anESD circuit, a gate driving circuit and a source driving circuit aredisposed on the substrate, the horizontally disposed scanning lines andthe vertically disposed data lines are coupled to correspondingcircuits, and the plurality of data lines and the plurality of scanninglines are successively disposed to be intersected to form a plurality ofpixel regions.

Specifically, the second discharge unit comprises a first conductingline with one end connected to the VCOM terminal, and the VCOM terminalis connected to GND. A line thickness required for a conducting lineused between the VGH terminal and the VGL terminal is small, which isequivalent to a large resistor station. A relative leakage current isalso small. A capability of the first discharge unit alone to performcurrent leakage is insufficient. However, the second conducting line isused for connecting to GND. A line width of the second conducting lineis greatly larger than line widths of VGH terminal and VGL terminal.Therefore, dischargeable current is greater than original current,achieving a better protection. The second discharge unit comprises afirst conducting line with one end connected to the VCOM terminal. TheVCOM terminal is connected to VCOM terminal of the display panel.However, the second conducting line is used for connecting to a VCOMterminal. A line width of the second conducting line is greatly largerthan line widths of VGH terminal and VGL terminal. Therefore,dischargeable current is greater than original current, achieving abetter protection. The display panel comprises a gate integratedcircuit. The VGH terminal and the VGL terminal are respectivelyconnected at a TFT voltage turn-on end and a TFT voltage turn-off end ofthe gate integrated circuit.

In another embodiment of the present application, the display panelcomprises a substrate including a plurality of pixel regions, and anelectrostatic discharge circuit disposed on the substrate and includinga VGH terminal, a VGL terminal, an electrostatic input end and a VCOMterminal coupled to components of the display panel; and a firstdischarge unit, where an output end of the first discharge unit isrespectively connected to the VGH terminal and the VGL terminal, and acontrol end and an input end of the first discharge unit are connectedto the electrostatic input end; and a second discharge unit, where aninput end of the second discharge unit is connected to the electrostaticinput end, and an output end of the second discharge unit is connectedto the VCOM terminal. The first discharge circuit comprises a first thinfilm transistor and a second thin film transistor. An output end of thefirst thin film transistor is connected to the VGH terminal. An inputend of the first thin film transistor and an output end of the secondthin film transistor are connected to the electrostatic input end. Aninput end of the second thin film transistor is connected to the VGLterminal. Since the connected first discharge unit and second dischargeunit act jointly and the other end of the second discharge unit isconnected to the VCOM terminal, an ESD current path is increased, andspeed and number of leakage current are increased, thereby realizing abetter protection for the display panel and prolonging service life. Thesecond discharge circuit comprises a third thin film transistor, acapacitor and a fourth thin film transistor. An input end and a controlend of the third thin film transistor are connected to the electrostaticinput end. An output end of the third thin film transistor is connectedto the VCOM terminal. The second discharge unit leaks current throughthe third thin film transistor, which is simple, effective and reliablein arrangement. A first end of the capacitor is connected to theelectrostatic input end. A second end of the capacitor is connected tothe control end of the third thin film transistor. Throughcharacteristics of direct current blocking, alternating currentconducting, high frequency conducting and low frequency blocking of thecapacitor, when a voltage range is within VGL to VGH, the seconddischarge unit does not participate in the effect. Meanwhile, when thevoltage range is not within VGL to VGH, for example, when a positivelarge voltage appears instantaneously, the second discharge unit can beproperly operated without producing VGL current reserved by the secondthin film transistor. Therefore, if an input voltage range of PIN (PINas the pin of the electrostatic input end) is within VGL to VGH, becausea capacitor can be regarded as an open circuit in direct current, thecapacitor and the thin film transistors do not act.

Specifically, as shown in FIG. 3, the first thin film transistor and thesecond thin film transistor are N-type thin film transistors: a firstN-type thin film transistor and a second N-type thin film transistor. Asource of the first N-type thin film transistor is connected to the VGHterminal. A gate of the first N-type thin film transistor is connectedto a drain of the first N-type thin film transistor, and a gate and adrain of the first N-type thin film transistor are also connected to thesource of the second N-type thin film transistor. A source of the secondN-type thin film transistor is connected to the electrostatic input end.A gate of the second N-type thin film transistor is connected to a drainof the second N-type thin film transistor, and a gate and a drain of thesecond N-type thin film transistor are also connected to the VGLterminal. A source of the third N-type thin film transistor is connectedto a gate of the first N-type thin film transistor. A drain of the thirdN-type thin film transistor is connected to the VCOM terminal. The VCOMterminal is connected to GND. A first end of the capacitor is connectedto the electrostatic input end. A second end of the capacitor isconnected to a gate of the third N-type thin film transistor.

When a positive large voltage instantaneously comes in the PIN, thefirst N-type thin film transistor is conducted and first dischargecurrent is generated. Since the potential of the PIN is increasedinstantaneously and a potential of a connection point between the secondend of the capacitor and the gate of the third N-type thin filmtransistor is simultaneously increased under a special efficacy ofcapacitive coupling, the third N-type thin film transistor is alsoconducted. At this moment, the positive large voltage of the PIN canleak current to GND. Since wiring of GND is usually thicker than wiringof VGL terminal, a corresponding resistance value is greatly smallerthan a resistance value of VGL terminal and the second discharge currentis greater than the first discharge current.

Of course, the first discharge unit can use a P-type thin filmtransistor, or use the N-type thin film transistor and the P-type thinfilm transistor together. For example, the first thin film transistorand the second thin film transistor are P-type thin film transistors: afirst P-type thin film transistor and a second P-type thin filmtransistor. A gate of the first P-type thin film transistor is connectedto a drain of the first P-type thin film transistor, and a gate and adrain of the first P-type thin film transistor are also connected to theVGH terminal. A source of the first P-type thin film transistor isconnected to the electrostatic input end. A gate of the second P-typethin film transistor is connected to a drain of the second P-type thinfilm transistor, and a gate and a drain of the second P-type thin filmtransistor are also connected to the source of the first P-type thinfilm transistor. A source of the second P-type thin film transistor isconnected to the VGL terminal.

In another embodiment of the present application, the display panelcomprises a substrate including a plurality of pixel regions, and anelectrostatic discharge circuit disposed on the substrate and includinga VGH terminal, a VGL terminal, an electrostatic input end and a VCOMterminal coupled to components of the display panel; and a firstdischarge unit, where an output end of the first discharge unit isrespectively connected to the VGH terminal and the VGL terminal, and acontrol end and an input end of the first discharge unit are connectedto the electrostatic input end; and a second discharge unit, where aninput end of the second discharge unit is connected to the electrostaticinput end, and an output end of the second discharge unit is connectedto the VCOM terminal. The first discharge circuit comprises a first thinfilm transistor and a second thin film transistor. An output end of thefirst thin film transistor is connected to the VGH terminal. An inputend of the first thin film transistor and an output end of the secondthin film transistor are connected to the electrostatic input end. Aninput end of the second thin film transistor is connected to the VGLterminal. Since the connected first discharge unit and second dischargeunit act jointly and the other end of the second discharge unit isconnected to the VCOM terminal, an ESD current path is increased, andspeed and number of leakage current are increased, thereby realizing abetter protection for the display panel and prolonging service life. Thesecond discharge circuit comprises a third thin film transistor, acapacitor and a fourth thin film transistor. An input end and a controlend of the third thin film transistor are connected to the electrostaticinput end. An output end of the third thin film transistor is connectedto the VCOM terminal. The second discharge unit leaks current throughthe third thin film transistor, which is simple, effective and reliablein arrangement. A first end of the capacitor is connected to theelectrostatic input end. A second end of the capacitor is connected tothe control end of the third thin film transistor. Throughcharacteristics of direct current blocking, alternating currentconducting, high frequency conducting and low frequency blocking of thecapacitor, when a voltage range is within VGL to VGH, the seconddischarge unit does not participate in the effect. Meanwhile, when thevoltage range is not within VGL to VGH, for example, when a positivelarge voltage appears instantaneously, the second discharge unit can beproperly operated without producing VGL current reserved by the secondthin film transistor. Therefore, if an input voltage range of PIN iswithin VGL to VGH, because a capacitor can be regarded as an opencircuit in direct current, the capacitors and the thin film transistorsdo not act. An input end of a fourth thin film transistor is connectedto the second end of the capacitor. A control end of the fourth thinfilm transistor is connected to the VGH terminal. An output end of thefourth thin film transistor is connected to the VGL terminal. Or, acontrol end of the fourth thin film transistor is connected to the VGLterminal. An output end of the fourth thin film transistor is connectedto the VGH terminal. Conduction of the fourth thin film transistorfurther completes a discharge function of the second discharge unit.Meanwhile, a potential of the second end of the capacitor is pulled tobe consistent with the VCOM terminal. Because of this, when the voltagerange is within VGL to VGH, the third thin film transistor is notconducted to discharge to influence proper operation of the protectioncircuit.

Specifically, as shown in FIGS. 4-5, FIG. 5 can be regarded as an actualequivalent circuit of FIG. 4. The first thin film transistor and thesecond thin film transistor are N-type thin film transistors: a firstN-type thin film transistor and a second N-type thin film transistor. Asource of the first N-type thin film transistor is connected to the VGHterminal. A gate of the first N-type thin film transistor is connectedto a drain of the first N-type thin film transistor, and a gate and adrain of the first N-type thin film transistor are also connected to thesource of the second N-type thin film transistor. A source of the secondN-type thin film transistor is connected to the electrostatic input end.A gate of the second N-type thin film transistor is connected to a drainof the second N-type thin film transistor, and a gate and a drain of thesecond N-type thin film transistor are also connected to the VGLterminal. The second discharge circuit comprises a third N-type thinfilm transistor, a capacitor and a fourth N-type thin film transistor. Asource of the third N-type thin film transistor is connected to a gateof the first N-type thin film transistor. A drain of the third N-typethin film transistor is connected to the VCOM terminal. The VCOMterminal is connected to GND. A first end of the capacitor is connectedto the electrostatic input end. A second end of the capacitor isconnected to a gate of the third N-type thin film transistor. A sourceof the fourth N-type thin film transistor is connected to the second endof the capacitor. A gate of the fourth N-type thin film transistor isconnected to the VGH terminal. A drain of the fourth N-type thin filmtransistor is connected to the VGL terminal. This is an embodiment ofthe protection circuit and defines specifically used electrical elementsand connection relationships. Since the potential of the PIN isincreased instantaneously and a potential of a connection point betweenthe second end of the capacitor and the gate of the third N-type thinfilm transistor is simultaneously increased under a special efficacy ofcapacitive coupling, the third N-type thin film transistor is alsoconducted. At this moment, the positive large voltage of the PIN canleak current to GND. Since wiring of GND is usually thicker than wiringof VGL terminal, a corresponding resistance value is greatly smallerthan a resistance value of VGL terminal and the second discharge currentis greater than the first discharge current. However, the fourth N-typethin film transistor also simultaneously pulls the potential of aconnection point between the second end of the capacitor and the gate ofthe third N-type thin film transistor to GND. Therefore, when a positivelarge voltage instantaneously comes in the PIN, the leaked current is asum of the first discharge current, the second discharge current and thethird discharge current. Compared with an individual action of the firstdischarge unit, a total leakage current is larger and a betterprotection is realized.

Of course, the first discharge unit can use a P-type thin filmtransistor, or use the N-type thin film transistor and the P-type thinfilm transistor together. For example, the first thin film transistorand the second thin film transistor are P-type thin film transistors: afirst P-type thin film transistor and a second P-type thin filmtransistor. A gate of the first P-type thin film transistor is connectedto a drain of the first P-type thin film transistor, and a gate and adrain of the first P-type thin film transistor are also connected to theVGH terminal. A source of the first P-type thin film transistor isconnected to the electrostatic input end. A gate of the second P-typethin film transistor is connected to a drain of the second P-type thinfilm transistor, and a gate and a drain of the second P-type thin filmtransistor are also connected to the source of the first P-type thinfilm transistor. A source of the second P-type thin film transistor isconnected to the VGL terminal.

In another embodiment of the present application, as shown in FIG. 2,the display panel comprises: a substrate including a plurality of pixelregions, and an electrostatic discharge circuit disposed on thesubstrate and including a VGH terminal, a VGL terminal, an electrostaticinput end and a VCOM terminal coupled to components of the displaypanel; and a first discharge unit, where the first discharge unitcomprises a first P-type thin film transistor and a second P-type thinfilm transistor, a gate of the first P-type thin film transistor isconnected to a drain of the first P-type thin film transistor, and agate and a drain of the first P-type thin film transistor are alsoconnected to the VGH terminal, a source of the first P-type thin filmtransistor is connected to the electrostatic input end, a gate of thesecond P-type thin film transistor is connected to a drain of the secondP-type thin film transistor, and a gate and a drain of the second P-typethin film transistor are also connected to the source of the firstP-type thin film transistor, and a source of the second P-type thin filmtransistor is connected to the VGL terminal; and a second dischargeunit, where an input end of the second discharge unit is connected tothe electrostatic input end, and an output end of the second dischargeunit is connected to the VCOM terminal. In the present application,since the connected first discharge unit and second discharge unit actjointly and the other end of the second discharge unit is connected tothe VCOM terminal, an ESD current path is increased, and speed andnumber of leakage current are increased, thereby realizing a betterprotection for the display panel and prolonging service life.

Specifically, the second discharge unit comprises a first conductingline with one end connected to the VCOM terminal. The VCOM terminal isconnected to GND. A line thickness required for a conducting line usedbetween the VGH terminal and the VGL terminal is small, which isequivalent to a large resistor station. A relative leakage current isalso small. A capability of the first discharge unit alone to performcurrent leakage is insufficient. However, the second conducting line isused for connecting to GND. A line width of the second conducting lineis greatly larger than line widths of VGH terminal and VGL terminal.Therefore, dischargeable current is greater than original current,achieving a better protection. The second discharge unit comprises afirst conducting line with one end connected to the VCOM terminal. TheVCOM terminal is connected to a VCOM terminal of the display panel.However, the second conducting line is used for connecting to VCOMterminal. A line width of the second conducting line is greatly largerthan line widths of VGH terminal and VGL terminal. Therefore,dischargeable current is greater than original current to achieve abetter protection. The display panel comprises a gate integratedcircuit. The VGH terminal and the VGL terminal are respectivelyconnected at a TFT voltage turn-on end and a TFT voltage turn-off end ofthe gate integrated circuit.

In another embodiment of the present application, the display panelcomprises a substrate including a plurality of pixel regions, and anelectrostatic discharge circuit disposed on the substrate and includinga VGH terminal, a VGL terminal, an electrostatic input end and a VCOMterminal coupled to components of the display panel; and a firstdischarge unit, where the first discharge unit comprises a first P-typethin film transistor and a second P-type thin film transistor, a gate ofthe first P-type thin film transistor is connected to a drain of thefirst P-type thin film transistor, and a gate and a drain of the firstP-type thin film transistor are also connected to the VGH terminal, asource of the first P-type thin film transistor is connected to theelectrostatic input end, a gate of the second P-type thin filmtransistor is connected to a drain of the second P-type thin filmtransistor, and a gate and a drain of the second P-type thin filmtransistor are also connected to the source of the first P-type thinfilm transistor, and a source of the second P-type thin film transistoris connected to the VGL terminal; and a second discharge unit, where aninput end of the second discharge unit is connected to the electrostaticinput end, and an output end of the second discharge unit is connectedto the VCOM terminal. Since the connected first discharge unit andsecond discharge unit act jointly and the other end of the seconddischarge unit is connected to the VCOM terminal, an ESD current path isincreased, and speed and number of leakage current are increased,thereby realizing a better protection for the display panel andprolonging service life. The second discharge circuit comprises a thirdthin film transistor and a capacitor. An input end and a control end ofthe third thin film transistor are connected to the electrostatic inputend. An output end of the third thin film transistor is connected to theVCOM terminal. The second discharge unit leaks current through the thirdthin film transistor, which is simple, effective and reliable inarrangement. The second discharge circuit comprises: A first end of thecapacitor is connected to the electrostatic input end, and a second endof the capacitor is connected to the control end of the third thin filmtransistor. Through characteristics of direct current blocking,alternating current conducting, high frequency conducting and lowfrequency blocking of the capacitor, when a voltage range is within VGLto VGH, the second discharge unit does not participate in the effect.Meanwhile, when the voltage range is not within VGL to VGH, for example,when a positive large voltage appears instantaneously, the seconddischarge unit can be properly operated without producing VGL currentreserved by the second thin film transistor. Therefore, if an inputvoltage range of PIN is within VGL to VGH, because a capacitor can beregarded as an open circuit in direct current, the capacitor and thethin film transistors do not act.

Specifically, as shown in FIG. 6, the third thin film transistor is aP-type thin film transistor: a third P-type thin film transistor. Asource of the third P-type thin film transistor is connected to a gateof the second P-type thin film transistor. A drain of the third P-typethin film transistor is connected to the VCOM terminal. The VCOMterminal is connected to GND. A first end of the capacitor is connectedto the electrostatic input end. A second end of the capacitor isconnected to a gate of the third P-type thin film transistor. Since thepotential of the PIN is increased instantaneously and a potential of aconnection point between the second end of the capacitor and the gate ofthe third N-type thin film transistor is simultaneously increased undera special efficacy of capacitive coupling, the third N-type thin filmtransistor is also conducted. At this moment, the positive large voltageof the PIN can leak current to GND. Since wiring of GND is usuallythicker than wiring of VGL, a corresponding resistance value is greatlysmaller than a resistance value of VGL and the second discharge currentis greater than the first discharge current.

In another embodiment of the present application, the display panelcomprises: a substrate including a plurality of pixel regions, and anelectrostatic discharge circuit disposed on the substrate and includinga VGH terminal, a VGL terminal, an electrostatic input end and a VCOMterminal coupled to components of the display panel; and a firstdischarge unit, where the first discharge unit comprises a first P-typethin film transistor and a second P-type thin film transistor, a gate ofthe first P-type thin film transistor is connected to a drain of thefirst P-type thin film transistor, and a gate and a drain of the firstP-type thin film transistor are also connected to the VGH terminal, asource of the first P-type thin film transistor is connected to theelectrostatic input end, a gate of the second P-type thin filmtransistor is connected to a drain of the second P-type thin filmtransistor, connected and a gate and a drain of the second P-type thinfilm transistor are also connected to the source of the first P-typethin film transistor, and a source of the second P-type thin filmtransistor is connected to the VGL terminal; and a second dischargeunit, where an input end of the second discharge unit is connected tothe electrostatic input end, and an output end of the second dischargeunit is connected to the VCOM terminal. Since the connected firstdischarge unit and second discharge unit act jointly and the other endof the second discharge unit is connected to the VCOM terminal, an ESDcurrent path is increased, and speed and number of leakage current areincreased, thereby realizing a better protection for the display paneland prolonging service life. The second discharge circuit comprises athird thin film transistor, a capacitor and a fourth thin filmtransistor. An input end and a control end of the third thin filmtransistor are connected to the electrostatic input end. An output endof the third thin film transistor is connected to the VCOM terminal. Thesecond discharge unit leaks current through the third thin filmtransistor, which is simple, effective and reliable in arrangement. Thesecond discharge circuit comprises: A first end of the capacitor isconnected to the electrostatic input end, and a second end of thecapacitor is connected to the control end of the third thin filmtransistor. Through characteristics of direct current blocking,alternating current conducting, high frequency conducting and lowfrequency blocking of the capacitor, when a voltage range is within VGLto VGH, the second discharge unit does not participate in the effect.Meanwhile, when the voltage range is not within VGL to VGH, for example,when a positive large voltage appears instantaneously, the seconddischarge unit can be properly operated without producing VGL currentreserved by the second thin film transistor. Therefore, if an inputvoltage range of PIN is within voltage gate low (VGL) to voltage gatehigh (VGH), because a capacitor can be regarded as an open circuit indirect current, the capacitor and the thin film transistor do not act. Acontrol end of the fourth thin film transistor is connected to the VGLterminal. An output end of the fourth thin film transistor is connectedto the VGH terminal. Conduction of the fourth thin film transistorfurther completes a discharge function of the second discharge unit.Meanwhile, a potential of the second end of the capacitor is pulled tobe consistent with the VCOM terminal. Because of this, when the voltagerange is within VGL to VGH, the third thin film transistor is notconducted to discharge to influence proper operation of the protectioncircuit.

Specifically, as shown in FIGS. 7-8, FIG. 8 can be regarded as an actualequivalent circuit of FIG. 7. The third thin film transistor and thefourth thin film transistor are P-type thin film transistors: a thirdP-type thin film transistor and a fourth P-type thin film transistor. Asource of the third P-type thin film transistor is connected to a gateof the second P-type thin film transistor. A drain of the third P-typethin film transistor is connected to the VCOM terminal. The VCOMterminal is connected to GND. A first end of the capacitor is connectedto the electrostatic input end. A second end of the capacitor isconnected to a gate of the third P-type thin film transistor. A sourceof the fourth P-type thin film transistor is connected to the second endof the capacitor. A gate of the fourth P-type thin film transistor isconnected to the VGL terminal. A drain of the fourth P-type thin filmtransistor is connected to the VGH terminal. Since the potential of thePIN is increased instantaneously and a potential of a connection pointbetween the second end of the capacitor and the gate of the third N-typethin film transistor is simultaneously increased under a specialefficacy of capacitive coupling, the third N-type thin film transistoris also conducted. At this moment, the positive large voltage of the PINcan leak current to GND. Since wiring of GND is usually thicker thanwiring of VGL, a corresponding resistance value is greatly smaller thana resistance value of VGL and the second discharge current is greaterthan the first discharge current. However, the fourth N-type thin filmtransistor also simultaneously pulls the potential of a connection pointbetween the second end of the capacitor and the gate of the third N-typethin film transistor to GND. Therefore, when a positive large voltageinstantaneously comes in the PIN, the leaked current is a sum of thefirst discharge current, the second discharge current and the thirddischarge current. Compared with an individual action of the firstdischarge unit, a total leakage current is larger and a betterprotection is realized.

In another embodiment of the present application, the presentapplication further discloses a display apparatus comprising a backlightmodule and the above display panel.

It should be noted that the substrate can be made of glass, plastics,etc. in the above embodiment.

In the above embodiment, the display panel comprises a liquid crystalpanel, an organic light-emitting diode (OLED) panel, a curved surfacetype panel, a plasma panel and the like. By taking the liquid crystalpanel as an example, the liquid crystal panel comprises a thin filmtransistor substrate (TFT Substrate) and a color filter substrate (CFSubstrate). The TFT substrate and the CF substrate are disposed oppositeto each other. Liquid crystals and photo spacers (PS) are disposedbetween the TFT substrate and the CF substrate. A thin film transistor(TFT) is disposed on the TFT substrate. A color filter layer is disposedon the CF substrate.

In the above embodiment, the CF substrate may comprise a TFT array. Acolor filter and the TFT array may be formed on the same substrate. TheTFT substrate may comprise the color filter layer.

In the above embodiment, the display panel of the present applicationmay be a curved surface type panel.

The above contents are further detailed descriptions of the presentapplication in combination with specific preferred embodiments. However,the specific implementation of the present application shall not beconsidered to be only limited to these descriptions. For those ofordinary skill in the art to which the present application belongs,several simple deductions or replacements may be made without departingfrom the conception of the present application, all of which shall beconsidered to belong to the protection scope of the present application.

The invention claimed is:
 1. A display panel, comprising: a substrateincluding a plurality of pixel regions; and an electrostatic dischargecircuit disposed on the substrate; wherein the electrostatic dischargecircuit comprises a voltage gate high terminal (VGH terminal), a voltagegate low terminal (VGL terminal), an electrostatic input end and acommon voltage terminal (VCOM terminal) coupled to components of thedisplay panel; and a first discharge unit comprising a first P-type thinfilm transistor (TFT) and a second P-type thin film transistor, whereina gate of the first P-type thin film transistor is connected to a drainof the first P-type thin film transistor, and a gate and a drain of thefirst P-type thin film transistor are also connected to the VGHterminal, a source of the first P-type thin film transistor is connectedto the electrostatic input end, a gate of the second P-type thin filmtransistor is connected to a drain of the second P-type thin filmtransistor, and a gate and a drain of the second P-type thin filmtransistor are connected to the source of the first P-type thin filmtransistor, and a source of the second P-type thin film transistor isconnected to the VGL terminal; and a second discharge unit, wherein aninput end of the second discharge unit is connected to the electrostaticinput end, an output end of the second discharge unit is connected tothe VCOM terminal, the second discharge circuit comprises a third thinfilm transistor, a capacitor and a fourth thin film transistor, an inputend and a control end of the third thin film transistor are connected tothe electrostatic input end, an output end of the third thin filmtransistor is connected to the VCOM terminal, the VCOM terminal isconnected to GND, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected tothe control end of the third thin film transistor, an input end of afourth thin film transistor is connected to the second end of thecapacitor, a control end of the fourth thin film transistor is connectedto the VGL terminal, an output end of the fourth thin film transistor isconnected to the VGH terminal, the third thin film transistor and thefourth thin film transistor are P-type thin film transistors: a thirdP-type thin film transistor and a fourth P-type thin film transistor, asource of the third P-type thin film transistor is connected to a gateof the second P-type thin film transistor, a drain of the third P-typethin film transistor is connected to the VCOM terminal, the VCOMterminal is connected to GND, a first end of the capacitor is connectedto the electrostatic input end, a second end of the capacitor isconnected to a gate of the third P-type thin film transistor, a sourceof the fourth P-type thin film transistor is connected to the second endof the capacitor, a gate of the fourth P-type thin film transistor isconnected to the VGL terminal, a drain of the fourth P-type thin filmtransistor is connected to the VGH terminal, the display panel comprisesa gate integrated circuit, and the VGH terminal and the VGL terminal arerespectively connected at a TFT voltage turn-on end and a TFT voltageturn-off end of the gate integrated circuit.
 2. A display panel,comprising: a substrate including a plurality of pixel regions; and anelectrostatic discharge circuit disposed on the substrate; wherein theelectrostatic discharge circuit comprises a voltage gate high terminal(VGH terminal), a voltage gate low terminal (VGL terminal), anelectrostatic input end and a common voltage terminal (VCOM terminal)coupled to components of the display panel; and a first discharge unitcomprising a first P-type thin film transistor and a second P-type thinfilm transistor, wherein a gate of the first P-type thin film transistoris connected to a drain of the first P-type thin film transistor, and agate and a drain of the first P-type thin film transistor are alsoconnected to the VGH terminal, a source of the first P-type thin filmtransistor is connected to the electrostatic input end, a gate of thesecond P-type thin film transistor is connected to a drain of the secondP-type thin film transistor, and a gate and a drain of the second P-typethin film transistor are also connected to the source of the firstP-type thin film transistor, and a source of the second P-type thin filmtransistor is connected to the VGL terminal; and a second dischargeunit, wherein an input end of the second discharge unit is connected tothe electrostatic input end, and an output end of the second dischargeunit is connected to the VCOM terminal.
 3. The display panel accordingto claim 2, wherein the second discharge unit comprises a firstconducting line with one end connected to the common voltage terminal(VCOM terminal), and the VCOM terminal is connected to GND.
 4. Thedisplay panel according to claim 2, wherein the second discharge unitcomprises a first conducting line with one end connected to the commonvoltage terminal (VCOM terminal), and the VCOM terminal is connected toa VCOM terminal of the display panel.
 5. The display panel according toclaim 2, wherein the second discharge circuit comprises a third thinfilm transistor, an input end and a control end of the third thin filmtransistor are connected to the electrostatic input end, and an outputend of the third thin film transistor is connected to the common voltageterminal (VCOM terminal).
 6. The display panel according to claim 5,wherein the second discharge circuit comprises a capacitor, a first endof the capacitor is connected to the electrostatic input end, and asecond end of the capacitor is connected to the control end of the thirdthin film transistor.
 7. The display panel according to claim 6, whereinthe second discharge circuit comprises a fourth thin film transistor, acontrol end of the fourth thin film transistor is connected to thevoltage gate low terminal (VGL terminal), and an output end of thefourth thin film transistor is connected to the voltage gate highterminal (VGH terminal).
 8. The display panel according to claim 2,wherein the second discharge circuit comprises a third thin filmtransistor, an input end and a control end of the third thin filmtransistor are connected to the electrostatic input end, an output endof the third thin film transistor is connected to the common voltageterminal (VCOM terminal), the second discharge circuit comprises acapacitor, a first end of the capacitor is connected to theelectrostatic input end, and a second end of the capacitor is connectedto the control end of the third thin film transistor.
 9. The displaypanel according to claim 2, wherein the second discharge circuitcomprises a third thin film transistor, an input end and a control endof the third thin film transistor are connected to the electrostaticinput end, an output end of the third thin film transistor is connectedto the common voltage terminal (VCOM terminal), the second dischargecircuit comprises a capacitor, a first end of the capacitor is connectedto the electrostatic input end, a second end of the capacitor isconnected to the control end of the third thin film transistor, thesecond discharge circuit comprises a fourth thin film transistor, acontrol end of the fourth thin film transistor is connected to thevoltage gate low terminal (VGL terminal), and an output end of thefourth thin film transistor is connected to the voltage gate highterminal (VGH terminal).
 10. The display panel according to claim 2,wherein the second discharge unit comprises a first conducting line withone end connected to the common voltage terminal (VCOM terminal), theVCOM terminal is connected to GND, the second discharge circuitcomprises a third thin film transistor, an input end and a control endof the third thin film transistor are connected to the electrostaticinput end, an output end of the third thin film transistor is connectedto the VCOM terminal, the second discharge circuit comprises acapacitor, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected tothe control end of the third thin film transistor, the second dischargecircuit comprises a fourth thin film transistor, a control end of thefourth thin film transistor is connected to the voltage gate lowterminal (VGL terminal), and an output end of the fourth thin filmtransistor is connected to the voltage gate high terminal (VGHterminal).
 11. The display panel according to claim 2, wherein thesecond discharge unit comprises a first conducting line with one endconnected to the common voltage terminal (VCOM terminal), the VCOMterminal is connected to a VCOM terminal of the display panel, thesecond discharge circuit comprises a third thin film transistor, aninput end and a control end of the third thin film transistor areconnected to the electrostatic input end, an output end of the thirdthin film transistor is connected to the VCOM terminal, the seconddischarge circuit comprises a capacitor, a first end of the capacitor isconnected to the electrostatic input end, a second end of the capacitoris connected to the control end of the third thin film transistor, thesecond discharge circuit comprises a fourth thin film transistor, acontrol end of the fourth thin film transistor is connected to thevoltage gate low terminal (VGL terminal), and an output end of thefourth thin film transistor is connected to the voltage gate highterminal (VGH terminal).
 12. The display panel according to claim 2,wherein the second discharge circuit comprises a third thin filmtransistor, a capacitor and a fourth thin film transistor, an input endand a control end of the third thin film transistor are connected to theelectrostatic input end, an output end of the third thin film transistoris connected to the common voltage terminal (VCOM terminal), the VCOMterminal is connected to GND, a first end of the capacitor is connectedto the electrostatic input end, a second end of the capacitor isconnected to the control end of the third thin film transistor, an inputend of a fourth thin film transistor is connected to the second end ofthe capacitor, a control end of the fourth thin film transistor isconnected to the voltage gate low terminal (VGL terminal), and an outputend of the fourth thin film transistor is connected to the voltage gatehigh terminal (VGH terminal).
 13. The display panel according to claim12, wherein the third thin film transistor and the fourth thin filmtransistor are P-type thin film transistors: a third P-type thin filmtransistor and a fourth P-type thin film transistor, a source of thethird P-type thin film transistor is connected to a gate of the secondP-type thin film transistor, a drain of the third P-type thin filmtransistor is connected to the common voltage terminal (VCOM terminal),the VCOM terminal is connected to GND, a first end of the capacitor isconnected to the electrostatic input end, a second end of the capacitoris connected to a gate of the third P-type thin film transistor, asource of the fourth P-type thin film transistor is connected to thesecond end of the capacitor, a gate of the fourth P-type thin filmtransistor is connected to the voltage gate low terminal (VGL terminal),and a drain of the fourth P-type thin film transistor is connected tothe voltage gate high terminal (VGH terminal).
 14. The display panelaccording to claim 2, wherein the second discharge circuit comprises athird thin film transistor, a capacitor and a fourth thin filmtransistor, an input end and a control end of the third thin filmtransistor are connected to the electrostatic input end, an output endof the third thin film transistor is connected to the common voltageterminal (VCOM terminal), the VCOM terminal is connected to GND, a firstend of the capacitor is connected to the electrostatic input end, asecond end of the capacitor is connected to the control end of the thirdthin film transistor, an input end of a fourth thin film transistor isconnected to the second end of the capacitor, a control end of thefourth thin film transistor is connected to the voltage gate lowterminal (VGL terminal), an output end of the fourth thin filmtransistor is connected to the voltage gate high terminal (VGHterminal), the third thin film transistor and the fourth thin filmtransistor are P-type thin film transistors: a third P-type thin filmtransistor and a fourth P-type thin film transistor, a source of thethird P-type thin film transistor is connected to a gate of the secondP-type thin film transistor, a drain of the third P-type thin filmtransistor is connected to the VCOM terminal, the VCOM terminal isconnected to GND, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected to agate of the third P-type thin film transistor, a source of the fourthP-type thin film transistor is connected to the second end of thecapacitor, a gate of the fourth P-type thin film transistor is connectedto the VGL terminal, and a drain of the fourth P-type thin filmtransistor is connected to the VGH terminal.
 15. The display panelaccording to claim 2, wherein the display panel comprises a gateintegrated circuit, and the voltage gate high terminal (VGH terminal)and the voltage gate low terminal (VGL terminal) are respectivelyconnected at a TFT voltage turn-on end and a TFT voltage turn-off end ofthe gate integrated circuit.
 16. The display panel according to claim 2,wherein the second discharge unit comprises a first conducting line withone end connected to the common voltage terminal (VCOM terminal), theVCOM terminal is connected to GND, the second discharge circuitcomprises a third thin film transistor, an input end and a control endof the third thin film transistor are connected to the electrostaticinput end, an output end of the third thin film transistor is connectedto the VCOM terminal, the second discharge circuit comprises acapacitor, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected tothe control end of the third thin film transistor, the second dischargecircuit comprises a fourth thin film transistor, a control end of thefourth thin film transistor is connected to the voltage gate lowterminal (VGL terminal), an output end of the fourth thin filmtransistor is connected to the voltage gate high terminal (VGHterminal), the display panel comprises a gate integrated circuit, andthe VGH terminal and the VGL terminal are respectively connected at aTFT voltage turn-on end and a TFT voltage turn-off end of the gateintegrated circuit.
 17. The display panel according to claim 2, whereinthe second discharge unit comprises a first conducting line with one endconnected to the common voltage terminal (VCOM terminal), the VCOMterminal is connected to a VCOM terminal of the display panel, thesecond discharge circuit comprises a third thin film transistor, aninput end and a control end of the third thin film transistor areconnected to the electrostatic input end, an output end of the thirdthin film transistor is connected to the VCOM terminal, the seconddischarge circuit comprises a capacitor, a first end of the capacitor isconnected to the electrostatic input end, a second end of the capacitoris connected to the control end of the third thin film transistor, thesecond discharge circuit comprises a fourth thin film transistor, acontrol end of the fourth thin film transistor is connected to thevoltage gate low terminal (VGL terminal), an output end of the fourththin film transistor is connected to the VGH terminal, the display panelcomprises a gate integrated circuit, and the voltage gate high terminal(VGH terminal) l and the VGL terminal are respectively connected at aTFT voltage turn-on end and a TFT voltage turn-off end of the gateintegrated circuit.
 18. The display panel according to claim 2, whereinthe second discharge circuit comprises a third thin film transistor, acapacitor and a fourth thin film transistor, an input end and a controlend of the third thin film transistor are connected to the electrostaticinput end, an output end of the third thin film transistor is connectedto the common voltage terminal (VCOM terminal), the VCOM terminal isconnected to GND, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected tothe control end of the third thin film transistor, an input end of afourth thin film transistor is connected to the second end of thecapacitor, a control end of the fourth thin film transistor is connectedto the voltage gate low terminal (VGL terminal), an output end of thefourth thin film transistor is connected to the voltage gate highterminal (VGH terminal), the third thin film transistor and the fourththin film transistor are P-type thin film transistors: a third P-typethin film transistor and a fourth P-type thin film transistor, a sourceof the third P-type thin film transistor is connected to a gate of thesecond P-type thin film transistor, a drain of the third P-type thinfilm transistor is connected to the VCOM terminal, the VCOM terminal isconnected to GND, a first end of the capacitor is connected to theelectrostatic input end, a second end of the capacitor is connected to agate of the third P-type thin film transistor, a source of the fourthP-type thin film transistor is connected to the second end of thecapacitor, a gate of the fourth P-type thin film transistor is connectedto the VGL terminal, a drain of the fourth P-type thin film transistoris connected to the VGH terminal, the display panel comprises a gateintegrated circuit, and the VGH terminal and the VGL terminal arerespectively connected at a TFT voltage turn-on end and a TFT voltageturn-off end of the gate integrated circuit.
 19. A display apparatus,comprising a backlight module and a display panel, wherein the displaypanel comprises: a substrate including a plurality of pixel regions; anelectrostatic discharge circuit disposed on the substrate; wherein theelectrostatic discharge circuit comprises a voltage gate high terminal(VGH terminal), a voltage gate low terminal (VGL terminal), anelectrostatic input end and a common voltage terminal (VCOM terminal)coupled to components of the display panel; and a first discharge unitcomprising a first P-type thin film transistor and a second P-type thinfilm transistor, wherein a gate of the first P-type thin film transistoris connected to a drain of the first P-type thin film transistor, and agate and a drain of the first P-type thin film transistor are alsoconnected to the VGH terminal, a source of the first P-type thin filmtransistor is connected to the electrostatic input end, a gate of thesecond P-type thin film transistor is connected to a drain of the secondP-type thin film transistor, and a gate and a drain of the second P-typethin film transistor are also connected to the source of the firstP-type thin film transistor, and a source of the second P-type thin filmtransistor is connected to the VGL terminal; and a second dischargeunit, wherein an input end of the second discharge unit is connected tothe electrostatic input end, an output end of the second discharge unitis connected to the VCOM terminal, the second discharge circuitcomprises a third thin film transistor, a capacitor and a fourth thinfilm transistor, an input end and a control end of the third thin filmtransistor are connected to the electrostatic input end, an output endof the third thin film transistor is connected to the VCOM terminal, theVCOM terminal is connected to GND, a first end of the capacitor isconnected to the electrostatic input end, a second end of the capacitoris connected to the control end of the third thin film transistor, aninput end of a fourth thin film transistor is connected to the secondend of the capacitor, a control end of the fourth thin film transistoris connected to the VGL terminal, an output end of the fourth thin filmtransistor is connected to the VGH terminal, the third thin filmtransistor and the fourth thin film transistor are P-type thin filmtransistors: a third P-type thin film transistor and a fourth P-typethin film transistor, a source of the third P-type thin film transistoris connected to a gate of the second P-type thin film transistor, adrain of the third P-type thin film transistor is connected to the VCOMterminal, the VCOM terminal is connected to GND, a first end of thecapacitor is connected to the electrostatic input end, a second end ofthe capacitor is connected to a gate of the third P-type thin filmtransistor, a source of the fourth P-type thin film transistor isconnected to the second end of the capacitor, a gate of the fourthP-type thin film transistor is connected to the VGL terminal, a drain ofthe fourth P-type thin film transistor is connected to the VGH terminal,the display panel comprises a gate integrated circuit, and the VGHterminal and the VGL terminal are respectively connected at a TFTvoltage turn-on end and a TFT voltage turn-off end of the gateintegrated circuit.